#define F_CPU 16000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#define LED1 PD6

volatile unsigned charcount=0;

void timer_setup(void)
{
	TCCR0B=(1<<CS02)|(1<<CS00);
	TIMSK0=(1<<TOIE0);
	TCNT0=0;
}

ISR(TIMER0_OVF_vect)
{
	count++;
	if(count==61)
	{
		PIND=(1<<LED1);
		count=0;
	}
}

int main(void)
{
	timer_setup();
	DDRD=(1<<LED1);
	PORTD=(1<<LED1);
	_delay_ms(1000);
	PORTD=0;
	sei();
	while(1);
}